My buddy Steve has decided he wants to up his power on the cossie.

He asked me what the best spec for a really nice driveable 420-450bhp

He dont want anything too laggy so possibly a GT series Turbo

Also wants to know peoples thought on compression ratios, head mods, headgaskets that are up to the job, e.t.c.

He still wants a good driveable car, hes engine build starts in 2 weeks,

All i have told him was choose the power you want and choose the smallest turbo you can get away with to get there